Unable to prevent self intersecting geometry?
First thing, move the Solidify mod above the Sub-D mod, then change the settings in the Solidify mod to &quot;Edge Data -&gt; Rim -&gt; 1.0&quot;
And check your crease values, there are a few of them, especially around that corner, that are not 1.0, this will screw up the Edge Data.

This will fix most of the problem.
After that, there will be a small issue left that is caused by the edges near that corner being a smaller distance away from the corner than your solidify value (1mm) This means that when Blender tries to offset them, they overlap. Simply move them away a little to fix the corner. Use GG to slide them away.
(These verts)

Remember, Blender is not CAD! There are a whole different set of rules to learn and follow! :)